EXPH 386 Exam 5 Questions and Answers Fully Solved Latest Version 2025-2026
functions of lung - Answersgas exchange
filtering blood and air
captures inhaled particles
breakdown vasoactive substances
vocalizations
breakdown vasoactive substances - Answersconverts angiotensin I to angiotensin II
(angiotensin converting enzyme in lungs)
bradykinin (80% inactivated in long)
serotonin (almost completely removed)
norepinephrine (30% removed)
PGE2 and PGF2 alpha (almost completely removed)
leukotrienes (almost completely removed)
VO2 at rest - Answers250 ml/min
VCO2 at rest - Answers200 ml/min
ventilation at rest - Answers5000 ml/min
cardiac output at rest - Answers5000 ml/min
VO2 during exercise - Answers3000 ml/min (normal)
6250 ml/min (athletes)
VCO2 during exercise - Answers3000 ml/min (normal)
7000 ml/min (athletes)
ventilation during exercise - Answers>60,000 ml/min
cardiac output during exercise - Answers30,000 ml/min
trachea - Answersfilters and almost completely humidifies air
bronchi - Answersserve as primary conduit into each of lungs
bronchioles - Answersconducts inspired air through a winding, narrow route until it mixes with
, existing air into alveolar ducts
alveoli - Answersprovide vital surface for gas exchange between lung tissue and blood
lobes - Answersleft lung has 2 lobes (space for heart)
right lung has 3 lobes (upper, middle, lower)
pleural space - Answersparietal and visceral linings
thin walled epithelial cells - Answersexposed to outside environment when gas exchange occurs
very think blood-gas barrier for diffusion
pores of kohn - Answersallow for even dispersion of surfactant to lower surface tension and
allows gas exchange b/t alveoli
surfactant - Answerslowers surface tension at gas-liquid interface by mixing with fluid around
alveoli
surfactant - Answerslipoprotein mix of phospholipids, proteins, and Ca produced by alveolar
epithelial cells which disrupts and lowers surface tension of lung
Fick's law of diffusion - Answersexplains gas exchange across the alveolar membrane
alveoli - Answersfunctional unit of lung
Law of laplace - AnswersP = (4 x T) / r
lungs are highly vascularized.... - Answersto allow for gas exchange
receives entire cardiac output
RBC transit time in lung capillaries is .75 sec
inspiration - Answersdiaphragm contracts and moves down ~10 cm
chest cavity elongates and enlarges
air expands in lungs
intrapulmonary pressure DECREASES
air is forced in lungs until Pi=PA
universal gas law - AnswersPV=nRT simplified to RV=T
Boyles law - Answersk =PV
if temperature is constant
functions of lung - Answersgas exchange
filtering blood and air
captures inhaled particles
breakdown vasoactive substances
vocalizations
breakdown vasoactive substances - Answersconverts angiotensin I to angiotensin II
(angiotensin converting enzyme in lungs)
bradykinin (80% inactivated in long)
serotonin (almost completely removed)
norepinephrine (30% removed)
PGE2 and PGF2 alpha (almost completely removed)
leukotrienes (almost completely removed)
VO2 at rest - Answers250 ml/min
VCO2 at rest - Answers200 ml/min
ventilation at rest - Answers5000 ml/min
cardiac output at rest - Answers5000 ml/min
VO2 during exercise - Answers3000 ml/min (normal)
6250 ml/min (athletes)
VCO2 during exercise - Answers3000 ml/min (normal)
7000 ml/min (athletes)
ventilation during exercise - Answers>60,000 ml/min
cardiac output during exercise - Answers30,000 ml/min
trachea - Answersfilters and almost completely humidifies air
bronchi - Answersserve as primary conduit into each of lungs
bronchioles - Answersconducts inspired air through a winding, narrow route until it mixes with
, existing air into alveolar ducts
alveoli - Answersprovide vital surface for gas exchange between lung tissue and blood
lobes - Answersleft lung has 2 lobes (space for heart)
right lung has 3 lobes (upper, middle, lower)
pleural space - Answersparietal and visceral linings
thin walled epithelial cells - Answersexposed to outside environment when gas exchange occurs
very think blood-gas barrier for diffusion
pores of kohn - Answersallow for even dispersion of surfactant to lower surface tension and
allows gas exchange b/t alveoli
surfactant - Answerslowers surface tension at gas-liquid interface by mixing with fluid around
alveoli
surfactant - Answerslipoprotein mix of phospholipids, proteins, and Ca produced by alveolar
epithelial cells which disrupts and lowers surface tension of lung
Fick's law of diffusion - Answersexplains gas exchange across the alveolar membrane
alveoli - Answersfunctional unit of lung
Law of laplace - AnswersP = (4 x T) / r
lungs are highly vascularized.... - Answersto allow for gas exchange
receives entire cardiac output
RBC transit time in lung capillaries is .75 sec
inspiration - Answersdiaphragm contracts and moves down ~10 cm
chest cavity elongates and enlarges
air expands in lungs
intrapulmonary pressure DECREASES
air is forced in lungs until Pi=PA
universal gas law - AnswersPV=nRT simplified to RV=T
Boyles law - Answersk =PV
if temperature is constant
